Aster was one of a line of shape-shifters created by the ZFT based on the Mysterious Creature's biology, and like her fellow shape-shifters, she ended up in the espionage business, using her shape-shifting abilities to infiltrate the ZFT's enemies. Upon her creation, she apparently had the memories of a kidnapped Malchiorian soldier downloaded into her brain, to help her blend into human society.
On one particular mission, she apparently found herself forced to flee a ship before it exploded. During another mission, she met BlackZarak, and witnessed the destruction of his ship. It's possible that these were actually the same mission.